It could have been a demo, i'm not sure - and i'm afraid i'm a little sketchy on the details.
Basically it was a 2D martial arts fighting game - mortal kombat setup, but with 4 players and you couldnt move off screen. As you gained points you got better belts according to the karate rankings i believe.
On the bonus stage bombs appeared on the floor which you had to kick off for points or avoid to stay alive.
I can still remember the controls though
When facing right:
Fire + Up = Jump Kick
Fire + Up Right = Headbutt
Fire + Right = Straight Kick
Fire + Down Right = High Kick
Down Right = Shin tap
Down = Slide Kick
Fire + Down = Turn + Slide Kick
Fire + Down Left = Turn + High Kick
Fire + Left = Turn + Straight Kick
(and my favourite, worth 1000 points and guaranteed to get a little gong sound)
Fire + Up Left = Jumping Double Splits Kick
hope someone can help me! i loved this game!